Electromagnetic ignition device



June 10,1930. RRl/GHETTQ 1,763,443

BLECTROIAGNETIC IGNITION DEVICE Filed Jan. 23.' 192s gwwzntoa a www Patented June 10, 1930 UNITED STATES PATENT OFFICE RUG-GERD RIGHETTO, OF TURIN, ITALY, ASSIGNOR F ONE-HALF TO SEVERINO TRI- SOGLIO AND ONE-HALF TO LUIGI CASTELLI, BOTH OF TURIN, ITALY ELECTROMAGNETIC IGNITION DEVICE Application tlled January 23, 1928, Serial No. 248,840, and in Italy January 22, 1927.

My present invention relates to an electromagnetically operated device adapted to light gas-nozzles, -burners or stoves, or fuel mixture iames generally, and has for its object to provide a device which will be adapted to be supplied both by direct and alternating current, and which will be of a very compact and cheap construction, and very practical in use.

Another object of the invention is to provide a device of the class set forth, which is com rised in but three elements, namely, a fixe core, a vibratory blade, and a substantially fixed blade, in addition to the usual magnitizing coil employed to energize the fixed core, the vibratory blade being the only element which vibrates when the core is energized.

I am aware that devices of the kind rey ferred to have been proposed, but have been, without known exception, provided with a movable core. In the known devices, however, the movable core tends to displace itself in order to bring its center of gravity to the middle of the magnetic field, and the energy of the latter is consumed in causing such displacement and to overcome the comparatively great inertia of the movable core. My improved device substantially consists of an electro-magnetical vibrator or sparking device, the sparking between the contacts of which is utilized for ignition purposes.

In carrying out the invention, I provide a suitablecoil Winding, not only to get such number of ampere-turns as will be capable of attracting the vibrating armature, but for the purpose of securing a comparatively low current, in order to avoid damages in the sparking points of the vibrating contacts. For such purpose I provide a very thin coil wire of a comparatively considerable length, so that the wire coil will itself provide for a sufficient resistance when the apparatus is put in a direct current circuit. If on the contrary the apparatus is put in an alternating current circuit, the impedance of the coil must be added to its own wire resistance, and the apparatus will therefore operate better and last longer.

With the foregoing and other equally important objects and advantages in view, the invention resides in the certain new and useful combination, construction and arrangement of part-s as will be hereinafter more fully described, set forth in the appended claims, and illustrated in the accompanying drawing, in which In the drawing:

Fig. l is a partial sectional view of said embodiment, while Fig. 2 is a diagram of the electrical connections.

Referring to the drawing, wherein like characters of reference designate corresponding parts throughout the two views thereof, the embodiment of the invention, as shown therein by way of example, comprises a coil l surrounding with a little play a soft iron core 2. While the coil is fixedly carried by the socket 8 of the device, the core on the contrary is axially displaceable and adjustable. For this purpose one end of the core is provided with a threaded rod 3 of brass or like paramagnetic metal, which will be adjusted in position by screwing it in a threaded hole of the cap 7, a milled nut 4 or the like serving as a lock-nut. The socket 8 carries a fixed band or tongue 6, while another band 5 is free to oscillate by being connected by a suitable hinge joint l2 to the socket.V At their free ends of the said bands are each provided with a contact or sparking point 14 and 13 respectively, the said points being made of a strong heat resisting metal, such as soft iron, and being so shaped as to be prevented from rapidly becoming worn out. 10 is a breaker arranged on the handle 9 of the device and adapted to close the supply circuit. l

The iron core is made displaceable so as to be adapted from time to time to compensate for the wear of the sparking points and thereby to keep constant the gap between the core pole and the vibrating band.

In the embodiment shown, ll denotes a spring adapted to press tongue 5 upon the fixed band 6, causing thereby the circuit to be closed even if the device be used in an inverted position, whereby the own weight of the said tongue might not bring it to contact with the band 6. It will however be understood that the said spring is merely shown for explanatory purposes and may have any desired shape.

The current leads are passed in a hole l5 within the handle 9 and led to the coil terininals.

The operation ot the device is self-explanatory, as clearly shown in the diagram of Fig. and requires no further explanation.

l claim:

l. iin electromagnetic ignition device comprising an exciting coil, a substantially fixed sparking point, an oscillating sparking point adapted to be magnetically actuated by said coil when the latter is energized, and a relatively movable core for `varying the magnetic el'lect oi' said coil whereby the amplitude ot movement oil said oscillating sparking point will be adjusted correspondingly with any increase in length oi the normal air gap between the latte' .and said iixed sparking point due to wear Vbv to var7 the am )litude ot movement thereoi" correspondingly with any increase in length 01"' the normal air gap between said sparking points by reason o' wear of the latter during continued use.

3. An electromagnetic ignition device comprising an exciting coil, a core axially displaceable within said coil, means supporting said coil, a substantially lixed blade, an oscillating blade adapted to be actuated by the magnetic e'l'ect of said core when said coil is energized, sparking points carried by said blades, and means 'jor adjusting said core relative to said oscillating blade whereby to vary the amplitude ot movement thereof correspondingly wit' any increase in length ot the normal air gap between said sparking points by reason ot wear of the latter during use, said means also acting to lock said rod and the core in any of the positions of adjustment thereof.

el. An electromagnetic ignition device comprising an exciting coil, a core axially displaceable within said coil, a frame enclosing said coil, a rod extending axially :trom said core, a substantially lixed blade, an oscillating` blade adapted to be vibrated by said core when said coil is energized, sparking points carried by said blades, and means engageable with said fra-me for adjusting said rod and the core relatively to said oscillating blade whereby to Vary the amplitude of movement thereof correspondingly with any increase in length of the normal air gap between said sparking points by reason of wear of the latter during use.

An electromagnetic ignition device comprising an exciting coil, a core axially displaceable within said coil, al frame enclosing said coil, a rod extending axially from said core and outwardly of said frame, a substantially fixed blade, an oscillating blade adapted to be vibrated by said core when said coil is energized, sparking points carried by said blades, and means engageable with the outer side of said frame for adjusting said rod and the core relatively to said oscillating blade whereby to vary the amplitude of movement thereof correspondingly with any increase in length of the normal air gap between said sparking points by reason ot' wear of the latter during use, said means acting to lock said rod and the core in any of the adjusted positions thereof when engaged with the said Jframe.

6. An electromagnetic ignition device comprising an exciting coil, a core axially displaceable within said coil, a support for said coil, a housing carried by said support and enclosing said coil, a screw threaded rod extending axially from said core and outwardly of said housing, a substantially lined blade extending from said support, an oscillating blade also extending from said support and adapted to be vibrated by said core when said coil is energized, sparking points carried by said blades, and means carried by the threaded portion of said rod and engageable with said housing for adjusting the rod and core relatively to said oscillating blade whereby to vary the amplitude of movement ol" the latter correspondingly with any increase in length of the normal air gap between said sparking points by reason of wear ot the latter during use.

In witness whereof I have hereunto set my hand.

RUGGERO RIGHETTO.

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